I have a Lowepro S&F Rover Lite. Doesn't seem like much, but it takes:

Linhof Color 4x5
6 lenses on lensboards (90,120,135,150,210,360mm)
Gossen SBC meter
Pentax Spotmeter
6 film holders
2 boxes of film + an empty one for exposed sheets
Polaroid holder, 10 sheets polaroid (not the box)
Changing bag
Dark cloth (T-shirt)
3/4 liter thermos of coffee

What more do you need?